package com.foreknow.demo10;

public class Test2 {
    private int a;
    int b;
    protected int c;
    public int d;

    public void haha() {
        this.a = 1;
        this.b = 2;
        this.c = 3;
        this.d = 4;
        //同一个类中都可以访问
    }
}
